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Finding the Fourth Proportional to 13,970.40, 20,912.40 and 12,415.20

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Solution

The fourth proportional to 13,970.40, 20,912.40 and 12,415.20 is: 18,584.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,970.40 : 20,912.40 = 12,415.20 : x
  2. Step 2: Convert to fraction form
    13,970.40/20,912.40 = 12,415.20/x
  3. Step 3: Cross multiply
    13,970.40x = 20,912.40 × 12,415.20
  4. Step 4: Simplify right side
    13,970.40x = 259,631,628.48
  5. Step 5: Solve for x
    x = 259,631,628.48/13,970.40
  6. Step 6: Final answer
    x = 18,584.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.